Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc7c8b3822016dc…

MALICIOUS

PDF

73.6 KB Created: 2021-09-16 20:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b9b5ee3fd44d3df2a34cc06e9366de0 SHA-1: 43dc3a80e3b24d51b0626ec0dbde0475ee20f1ec SHA-256: cfc7c8b3822016dcc4cdc05cf42ec3d628066de389e3ac406b8f6e5e2f34bf6a
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic indicates it's a link farm designed to obscure the true destination. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to trick the user into downloading a password-protected archive, likely containing malware, by offering a fake utility. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dichvumucin.com/upload/ckupload/files/76310854553.pdf In PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///47364485878.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210904_7DE6188F522A62FE.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/20040840444.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210905_91DE4566AD27C390.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/tibepefiwunuzenulovimi.pdfIn PDF document text
    • http://esistore.de/userfiles/file/xadudogixefufodama.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/84069414932.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/wafuwav.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd751320fa---nujatitetimesowigedena.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/lonogoraji.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/29522579338.pdfIn PDF document text
    • http://eternaseguros.net/files/files/rudof.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/169274228e76cc079d7358f2369a54f0/wakukiviger.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/64835101518.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/14687494665.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/naweruw.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/lebugunavoruwonikobewosil.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/29446995063.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/ruzevuduxivosaxok.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/mebezowigozonowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=free+pdf+password+remover+softwarePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBC 17132 bytes
SHA-256: 550dce476f2a8cbb9b4e1055c77aa89c59c36bfbe3378fd1fcd7b28ecd070ef4
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 10544 bytes
SHA-256: d65cb0762be47270112da6a01d83b086c414ff3209af48ba5b32554824da655e

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